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// SPDX-License-Identifier: GPL-2.0-only
/*
* Based on the x86 implementation.
*
* Copyright (C) 2012 ARM Ltd.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*/
#include <linux/perf_event.h>
#include <linux/kvm_host.h>
#include <asm/kvm_emulate.h>
DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available);
static unsigned int kvm_guest_state(void)
{
struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
unsigned int state;
if (!vcpu)
return 0;
state = PERF_GUEST_ACTIVE;
if (!vcpu_mode_priv(vcpu))
state |= PERF_GUEST_USER;
return state;
}
static unsigned long kvm_get_guest_ip(void)
{
struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
if (WARN_ON_ONCE(!vcpu))
return 0;
return *vcpu_pc(vcpu);
}
static struct perf_guest_info_callbacks kvm_guest_cbs = {
.state = kvm_guest_state,
.get_ip = kvm_get_guest_ip,
};
void kvm_perf_init(void)
{
perf_register_guest_info_callbacks(&kvm_guest_cbs);
}
void kvm_perf_teardown(void)
{
perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
}
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